/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/IntervalGizmo.h
Called when an interval is changed. The delegate gives a pointer to the gizmo, the direction of the interval in gizmo space, and the new parameter value.
typedef TMulticastDelegate_ThreeParams< void, [UIntervalGizmo](API\Runtime\InteractiveToolsFramework\BaseGizmos\UIntervalGizmo) *, const FVector &, float > FOnIntervalChanged